Genesis 11:3, 7

They said one to another, “Come, let us make bricks and fire them thoroughly [in a kiln, to harden and strengthen them].” So they used brick for stone [as building material], and they used tar (bitumen, asphalt) for mortar.

Come, let Us (Father, Son, Holy Spirit) go down and there confuse and mix up their language, so that they will not understand one another’s speech.”